Influence of Modifying Mixtures on Si Crystal Formation in Al-7%Si Alloy; Metals; Vol. 8, iss. 2

Influence of Modifying Mixtures on Si Crystal Formation in Al-7%Si Alloy; Metals; Vol. 8, iss. 2

Bibliographic Details
Parent link:	Metals Vol. 8, iss. 2.— 2018.— [98, 14 p.]
Corporate Author:	Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение русского языка
Other Authors:	Zykova A. P. Anna Petrovna, Kazantseva L. A. Lyudmila Alekseevna, Popova N. A. Nataljya Anatoljevna, Vorozhtsov A. B. Aleksandr Borisovich, Kurzina I. A. Irina Aleksandrovna
Summary:	Title screen Using scanning and transmission electron microscopy, we studied silicon particles formed during the solidification of Al-7%Si alloy when different modifying mixtures were introduced into the melt: (1) a mixture of ultrafine powders Na3AlF6 + K2ZrF6 + TiO2 + ZrO2; (2) K2ZrF6; and (3) the flux Arsal. By differential scanning calorimetry, it was established that modifying mixtures significantly influenced the temperature of the solidification processes. The formation of two types of Si crystals was established. The first type of Si crystals precipitated during the solidification of the eutectic mixture (?-Al + Si) in the form of needles or plates. The second type of Si crystals was segregated from eutectic Al-phases or segregated from the solid phase ?-Al upon cooling in the solid state. The introduction of modifiers led to a shift in solidification temperatures. When fluoride salts were used, there was an increase in the temperature of eutectic solidification. Silicon crystals were large (up to 10 µm), with a local excess of aluminum concentration
Language:	English
Published:	2018
Subjects:	электронный ресурс труды учёных ТПУ Al-7%Si alloy modification ultrafine powders fine structure phase composition ультратонкие слои фазовый состав
Online Access:	https://doi.org/10.3390/met8020098 http://earchive.tpu.ru/handle/11683/57789
Format:	Electronic Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=660042

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